Carbon Fiber Pre-Oxidation Tunnel Furnace

The Carbon Fiber Pre-Oxidation Tunnel Furnace is a core and critical piece of equipment in carbon fiber production lines, specially designed for the staged thermal stabilization (pre-oxidation) treatment of polyacrylonitrile (PAN)-based precursor fibers.Through precisely controlled multiple independent temperature zones, a highly uniform hot air circulation system, and strict exhaust extraction design, the equipment enables precursor fibers to undergo chemical cross-linking under specific temperature and tension conditions. The linear molecular structure is transformed into a heat-resistant ladder-like six-membered ring network structure, laying a solid foundation for the subsequent high-temperature carbonization process.

Product Applications

Precursor Fiber Thermal Stabilization:

Converts PAN-based precursor fibers into non-melting and flame-resistant oxidized PAN fibers.

Aerospace and Defense Applications:

Used for producing high-performance carbon fibers applied in aircraft structural components, missile casings, and satellite components.

Automotive Lightweight Applications:

Used for carbon fiber material modification and large-scale production of automotive body structures, chassis components, and composite parts.

Wind Power and Pressure Vessel Manufacturing:

Used for manufacturing large-tow carbon fiber materials for wind turbine blade beams and high-strength composite pressure vessels such as hydrogen storage cylinders.

Product Parameters

Product Features

Uniform Temperature Control:

The unique double-side/top hot air circulation design ensures extremely low temperature differences throughout the furnace chamber, preventing local overheating of precursor fibers.

Precise Tension Control:

Integrated advanced unwinding and traction tension control systems effectively suppress fiber shrinkage during the pre-oxidation process.

Explosion-Proof Safety:

Equipped with multi-point exhaust gas concentration monitoring and independent extraction systems to promptly remove harmful and combustible gases generated during the reaction.

Energy Efficient Operation:

Uses high-density composite insulation materials combined with heat recovery technology to significantly reduce energy consumption during operation.

FAQ

Q1: Why is temperature control accuracy so important for the pre-oxidation tunnel furnace?

A1:Pre-oxidation is an intense exothermic reaction. If temperature control is inaccurate or local overheating occurs, concentrated heat release may cause precursor fibers to burn or break, and may even create fire hazards.

Q2: How does the equipment handle exhaust gases generated during the pre-oxidation process?

A2:The equipment is equipped with a dedicated exhaust collection manifold and extraction fans. Harmful gases such as hydrogen cyanide (HCN) and ammonia generated during the reaction are quickly removed and transported to an exhaust treatment system.

Q3: What heating methods are commonly used for this tunnel furnace?

A3:The equipment generally uses electric heating or indirect natural gas heating through heat exchangers. Combined with high-volume hot air circulation, these methods ensure stable temperature control throughout the process.

Q4: How does the equipment prevent tow entanglement or abrasion inside the furnace?

A4:The furnace is equipped with precision guide rollers and fiber support devices. Combined with multi-stage tension compensation systems, it ensures that the tow remains flat and maintains the preset tension during operation.

Q5: Can the length and width of different temperature zones be customized?

A5:Yes. The equipment adopts a modular design and can be customized according to customers’ annual production targets (such as hundreds or thousands of tons per year) and precursor fiber specifications.